RFE Replied on INS Envelope

AllForGC

Registered Users (C)
I had gotten an RFE for Biometrics which I had done already on the next day of filing EAD Online. In the RFE they asked me to do that and send back the RFE letter with the date I do my biometrics. I did that and send back the RFE letter in the regular INS with the 37 cents stamp. Its been almost 10 days since I mailed and my message still shows the same. Is this normal ?

Any idea how long it would take and also was it a safe thing to send RFE reply on INS Envelope?. The envelope seemed to be made up of very cheap quality paper.

Gurus pls respond.
 
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