Is anyone else finding that auction houses are now requiring a pre-1898 gun go to a FFL?

Has something changed or are the auction houses playing it safe if they can not clearly document the gun was made prior to 1898.

This is at least the second time this has happened to me. It won't stop me from purchasing anything, but I am curious.

I have become addicted to English hammered shotguns to the detriment of my wallet.