Mailed I-129F to Nebraska 5/24. Received electronic confirmation of receipt on 5/25 and TODAY my check has been cashed. Alas, I cannot read the case number on the back. USCIS site says it begins with either EAC, WAC, LIN, SRC and 10 numbers. I see the receipt stamp says it's from the California service center. Can anybody tell me if the numbers are big, or tiny or what? There are numbers all over the back of the check. At least we're in the system!!!!

Congratulations! I found my WAC# on the back of my check in the Endorse Here area. The numbers are relatively small and were difficult to read. Now you can set up an account to monitor your case online.

The numbers are pretty small.
Call your bank and see if they would read them off for you. Try their customer service number (that's what I did and it worked like a charm )

congrats and good luck!!!

I'm not sure which numbers are sensitive to my case, so I'll skip posting the actual pic (yes, I saved a jpg of my check!), and just change the numbers to be fake ones. Hopefully this should help!

On the back of my cancelled check, I have something similar to this:

For Credit to U.S. Treasury
DOJ/USINS X1 1234567890
123456 WACTAB12 12-34-5678
------------------------------------
WAC1234567890 <------ THIS IS THE NUMBER


Edit:
There was a stamp saying which service center cashed the check also. It does NOT contain the number. Rather, it contains a duplicate of that WACT thingie you see on the third line in the other stamp. Just in case it is relevant to you, here is what the other stamp said:

PAY TO THE ORDER OF
BANK OF AMERICA
1234567890
FOR DEPOSIT ONLY
US TREASURY-TGANET WEST
CITIZENSHIP & IMMIGRATION SVCS
CALIFORNIA SERVICE CENTER
??C #12345678
1234567890 CA

Wow, they sure took their sweet time cashing the check. Congratulations