One thing to bear in mind - when setting up an eBay listing to accept offers, there is an option to automatically accept offers of at least a specified amount and conversely to automatically reject offers below a specified amount. It is quite possible that your offers were rejected automatically, especially if it occurred immediately. I have used this feature several times myself, it keeps your mailbox from being filled with ridiculous lowball offers, e.g.: $50 for a fully restored 8/8 Wostenholm FBU, etc.