UK's "Floating Culture" Crisis in the Making

EBay seller  (uksales(9054), 'Lizzy's Bits and Bobs', Nottingham NG13 8BA) has a 'Matching Pair of Large Anglo Saxon Saucer Brooches, Chip Carved & Gilt, 5th - 6th Century ' for sale. They are not on the PAS database, or any other:

I’m selling these on behalf of the same lady whose husband had all the cut half and quarter Hammered Silver coins. I’ve been advised that these are a matching pair and as such, rarer than the sum of the individuals. Comes with a ticket saying what they are, where he bought them and how much he paid (I’ve digitally redacted that).
I don’t know if weight is important but I’ve included images of the brooches in my scales. All the proceeds of this sale, and that of the other Saxon brooch she has (I’ll list that for her once these sell), after Ebay fees, will go to the widow. [...]

In fact she has what she says is a shield knob:

Anglo Saxon Chip Carved Gilt 6th Century Shield Stud - Beautiful!! (B371) From the same source as the large saucer brooches and again, I’m selling on behalf of the widow.

The most likely source of a matching pair of saucer brooches reaching the antiquities market would be from the robbing of a female grave. Some time before 1989 the grave was penetrated and stripped of some of the diagnostic finds, and without any problems were on open sale in the centre of York (just down the road from the CBA) when an anonymous bloke bought it 30 years ago but did not enquire (or if he did, preserve) any findspot data or information about title to sell and whether the landowner was part of the deal. Now he's died, his widow is also cashing in on the deal. An archaeological context has been damaged, leaving so many questions unanswered. And what happens when 27000 metal detectorists with collections all die? Have we any archaeologists who want to discuss the issue of all that "floating culture" they've turned archaeological evidence into? Any?