[mrreality68]

I do not know the answer

but any loss is not good for the hobby, for that collector or reseller.

Yes it shrinks the inventory and could obviously effect Supply/Demand depending on the card or item but

1. to me losing pieces of history and pieces that bring people joy is sad.
2. Insurance cannot replace the item so lost is lost
3. most people do not have insurance or the proper amount of insurance to cover the lost
4. often times these items have memories attached given down thru family and generations and no more
5. the loss of income from the money put in and the time put in etc.

How much was lost that was never known or found or the families did not know what or the value of what they had

But that is part of the collecting cycle just as discovering of cards that were lost or never known to exist (ie the Black Swamp find), The Yatzee box find etc