Is it possible for the post office to put together an alphabetic list of mail box holders (if they don't have one already), so when someone, by mistake, sends a package to a street address it can be cross referenced to the p.o. box? Instead the packages are marked undeliverable, put back on the truck, handled many times back to the sender. Then the sender corrects the address and mails it back to the correct p.o. address. I imagine this is expensive and time consuming and not very green. The US mail does not charge for all of this extra handling. Wouldn't be more cost effective and easier to cross-check the name against the reference list than going through all of this hassle? I figure the whole process should not take more than 25 seconds.