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兩個月前在網上申請了綠卡的removal of conditions, 移民局已經把錢收了，但是從來沒有收到Receipt letter 和 receipt number，這個有什麽問題嗎？

-It should be fine because USCIS received your filing fee (this can be used as your filing evidence).

You may submit an "e-Request" on the following USCIS website for non-delivery of notice:

e-Request - Non-Delivery of Notice

Or email to: [e-mail]

很擔心過了90天如果移民局說沒有收到會有麻煩。