I bought a gun last week.

I promptly mailed the seller two POSTAL money orders for 1000 each.

Get an email today.  "My bank froze the MO for 7 days because they thought they were fake Money Orders. It also takes the USPS 7 days to update their system, so when my bank called the USPS, it was not in their system, so the "fraud team" froze the money. Hopefully they will unfreeze it tomorrow"

What the fuck is that all about!?  how could this happen!!

I know they are legit, but its putting some strain on an otherwise very very painless transaction.

It's the Nigerian scammer's fault.  

Seriously, USPS MO's have been the target of many internet scams lately.  These systems are set up to protect the seller (reciever of MO) now.