Auction Houses Wary of Antiquities?

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Here is an interesting comment from a frequent auction goer, an antiquity collector who however is not among those that avoids reading what is written here. He notes that these days the auction houses are copping it almost every time they publish a catalogue of an antiquities sale. He suggests they are getting more careful to be covered should questions arise about the collecting history of the items on offer. He makes an interesting point worth checking out:

have you noticed that they only leave a window of 3-4 weeks for their antiquities catalogs to go online but with other sales they are online 4-6 weeks before the sale?

well, actually I had noticed that when you run your eyes down the list of forthcoming auctions of certain firms, prints and drawings and furniture seem to be advertised well in advance, but its rare on casual visits to see when the next antiquity sale will be.