I have re - read the report in the Mirror.
https://babel.hathitrust.org/cgi/pt?id=njp.32101075454072&view=1up&seq=361&q1=glassOn re-reading to me it appears to read that the supply of articles for her Majesty's table were procured separately. It doesn't state they were supplied by Davenports.
It is very specific about two enamelled glass dessert plates (We think Thomas Hawkes perhaps - from discussion with KevH on another thread?) that were used by 'Her Majesty' and the 'Duchess of Kent'. It says they were owned by Messrs. Hetherington & Co of Regents Quadrant (I looked them up and they appear to be lamp dealers?).
It also states very clearly that they were 'a new introduction which attracted great notice' and says they were 'expressly manufactured for the occasion'. (see left hand column bottom half of section in photo attached).
This could imply that other items for Her Majesty's table were items already held at Guildhall.
Then it discusses the Queen's table and what was on there, but no statement of who made or supplied the crockery or glass.
Then it very specifically states that the supply for the masses, 'the entertainment generally' i.e. not the top table, was supplied by Davenports. It does not specify the Davenports when listing the crockery and glass for Her Majesty's table.
(In addition to this, I'm bemused because there were other banquets at Guildhall, so I presume they didn't have enough crockery for the 'entertainment generally' or didn't want to use what they had, for this particular banquet.)
So just my thoughts here:
Could it be, the crockery and glass for Her Majesty's table was already available at the Guildhall? The decoration would fit maybe with King William?, but that it had to have the VR painted in the middle. So perhaps that was sent off to Davenports to be enamelled? or perhaps enamelled elsewhere?.
The glass had an engraved border and the Royal Arms. That might have been stock they already had with the engraved border ok for King William and the Royal Arms likewise?
Likewise the earthenware jugs which had the Royal and City arms.
Then separate to those top table items which the Guildhall already held, Davenports supplied a mass of china and glass for the main guests tables 'the entertainment generally'.
If my theory is correct, then even
IF the uranium glass bowls in the V&A and the Corning
were a part of the set of a 'dozen topaz finger glasses' cited by the Mirror, they would fall under the Royal Table crockery and glass ... that was not supplied by Davenports.
The Guildhall held other banquets so presumably had enough crockery and glass to supply those banquets. But perhaps not enough to supply a matching set for guests of a banquet as big as the QV banquet.
Therefore they asked Davenports to supply for the masses, washed it all and sent it all back because they already had large stock in house that hadn't been used for this banquet?
Which would explain why there was no evidence in the Davenport documentation of an invoice or even a mention, and no evidence of Davenport being mentioned in the Report of the Guildhall Banquet or cost apportioned to them which it was to every other supplier and greatly itemised.
And there would have been no reason for Davenports to publicise this because the items they supplied hadn't been used by the Queen or top table so no PR to gain from that.
I can't think what might have happened to the limited selection of items used for the top table but perhaps they were items the Guildhall kept for Royal banquets dating from King William times (given the decoration on them) and from thence onwards into Victoria's reign where the VR now being enamelled on the plates from this first of her banquets would have been fine. There were other Royal banquets held there at later dates.