RFE

yo, i sent my RFE response to the service center processing my case but did not write the “Attn: RFE” on the outer envelope.

the RFE stated I should write ‘PREMIUM PROCESSING” and mailbox number if i choose to mail it to their physical address. it’s an IOE case too.

i did see the response was delivered and signed unbehalf of the director about 5 days ago but my case status have not changed. should i be worried?