When mailing to USCIS, is it necessary to write on the envelope what application it is?

Eoh

New Member
#1
I submitted my first OPT application (i-765) and realized I didn't follow the suggestion to write "OPT Application" on the envelope. I mailed the application extremely late (just 2 weeks before the deadline) and couldn't afford it to be delayed in processing. Would this be a potential problem at the lockbox facility and cause delay in processing? I would really appreciate some opinions.
 
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