I've sent a book that was requested on April 9, printed an mailed it on April 9. 

I use PBS money and the DC so this is the information I have on the book: 

It probably has been delivered. Maybe they are just busy and haven't got online.

Usually arrival at unit means its at their post office, than delivered means its in their mailbox.

And it could also mean it was delivered next door to her neighbor who decided to keep the book.

Delivered usually means it's been delivered to an address....doesn't mean it's the RIGHT address, but somewhere. I've had books misdelivered myself, and thankfully had an honest neighbor who did get them to me eventually. Since there is no signature required with DC, it isn't really a true guarantee that the person you sent it to has it in their hands.

That said, I have had books scanned as delivered several days before I actually got the book, so who knows? I think "arrival at unit" means it's arrived at the destination post office where that person' mail is delivered from.

Cheryl

Whoops!  I forgot the book may have been delivered to the house on the next block.  I get a neighbors mail because our house numbers are the same and we're one block apart.  The street names aren't even close but those numbers match.

I'll know if it goes lost won't I? 

I had a book go lost enroute to me in Jan.  It shows as delivered on Jan 8th but I have never seen this book. I checked at the post office with no luck.  I'm assuming it was misdelivered at this point and whoever got it has tossed it out or just kept it.

Since you bought PBS postage and DC you are assured of keeping your credit for the book.  If it gets declared "lost" by PBS the requester will get her credit returned and PBS "eats" the cost.  So until it is marked recieved there is nothing you can or should do.  Let the system work the way it is designed to do.  Trying to understand the mysteries of the USPS is not an easy thing.  I've seen books coming to me marked the same way you have seen this book, and it still took days or a couple of weeks before it showed up in my mailbox.  I figured it was sitting on a mail carrier's desk or station for that time waiting for a light day to be delivered.

Ruth

ETA - yes - you will be able to tell if it gets declared "lost".

If it is about to go lost you could also politely PM the other member and ask if they happened to receive the book. Sometimes people just forget to mark received!

I'm in a similar situation right now... waiting for a book to be marked received (USPS confirmation shows "delivered").

Unfortunately I didn't buy PBS postage, so I have to just sit & wait for the person to mark it received before I get my credit.  Grrrrrrrrrrrrrrrrrrrrr.  This is why, unless at all impossible, I buy postage and delivery confirmation through PBS - I get my credit right away!

I mailed  a book First Class on April 2nd.  After 2 weeks, I clicked on the PM button to see who the requestor was so I could go to their profile and see if they had their account on vacation hold.  I discovered their account was suspended.  I am still waiting for the system to mark the book received.  Maybe it only happens just before the book would be declared lost.