We have 2x stores.

We normally don't list auctions as the loss of the insertion fee when they don't sell is too much for us to recover.

When they hand out FREE listings we list lots of same items as auctions.

But all with different run times. e.g. 1, 3, 5 days etc. Maybe this makes them non-duplicates.

We have only ever been pinged once for a duplicate listing and that was a BIN listing where we had inadvertently doubled up. They removed it and notified us. We said oops! and moved on.

But every time we get the FREEs we do this and they have never once pinged us, no matter if/not the items sell. We've been doing this now for best part of a year.

So we are quite unsure of just exactly what the rule is here, seems a bit unclear, but so far so good.