I have checked DC on a couple of the books I sent out recently and they both show as delivered.  How long wouldl you wait before PM'ing the recipient to remind them to mark the book as received?

I usually wait a week.  With last week being a Holiday week, possibly a little longer.

I wait until just before they are about to go lost. Like 3 or 4 days before.

Also, you can't assume that they were actually delivered, even if that is what the DC scan says. I would send a PM asking IF they were delivered, not to please mark them received.

A delivered DC scan means it was delivered somewhere, not necessarliy to the correct address. Or, the receiver may be on vacation, etc and not able to mark things received.

Eh, I think if that ever happens to me again, I probably won't send a PM since I use PBS postage and therefore, get my credit even if it goes lost.

I waited until it almost went lost - it had been marked delivered and it was - to the post office!  They were on vacation and actually picked up their mail on the day the book was going lost.

I use PBS/DC now and don't worry about it.

Also, PBS will be sending them emails reminding them to mark the book received.  I had one that I hadn't received and if I remember I received three or four emails telling me to mark it received if I had received it.

I usually PM after a week...if it was misdelivered I like to have them follow up if possible while it's still in the general timeframe of the supposed delivery.

Eh, I think if that ever happens to me again, I probably won't send a PM since I use PBS postage and therefore, get my credit even if it goes lost.

Amy, I encourage you to reconsider that thought. You have your credit yes, but the site needs to cover the credit being returned to the requester so it costs them every time a book goes lost without any followup.

I usually wait 1 week after the delivery scan (closer to 10 days if there is a holiday in there) and then PM them asking them to double check if they've received the book because starting the USPS search for the book as quickly as possible betters the chance that the carrier remembers what they did with it if it was misdelivered or lost in their vehicle.   Every single book I have PMed had been delivered correctly and at least one would have probably never been marked if I hadn't followed up.

It's not how long you wait, it's how you word the PM.   Asking about starting the USPS search for them is a good way to do it.  PMs are already coming from PBS, getting more from you can really piss off folks who have not yet received the book.