According to the For Sale Guidelines, announcements of eBay auctions are acceptable for petroliana items in either the For Sale Petroliana With Prices section or the Online Auctions, eBay section.

Since the bid price is subject to change, there isn't a set price. Sellers should put the current bid value in their post at the time it is posted.

This has not been enforced for eBay auction announcements in the past because the final selling price is seldom the price at the time the announcement of posted.
Jim "Oldgas" Potts
Your host and moderator