QUOTE(Carolyn @ Mar 30 2008, 06:21 PM)

We sent ours overnight through the USPS...we were very close to the expiration date of the conditional residency, and wanted to be sure they got it on time.
It was very much worth the $16.95 to be able to check on the USPS tracking website that Nebraska had received it the next morning!
Good luck!
Carolyn
You did not even have to do that, USCIS will use the Post Mark on the package to determine if it was late or not, this only is the case if you use USPS, this is NOT the case if you use UPS, FED-EX or any other currier service.