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两个月前在网上申请了绿卡的removal of conditions, 移民局已经把钱收了，但是从来没有收到Receipt letter 和 receipt number，这个有什么问题吗？

-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]

很担心过了90天如果移民局说没有收到会有麻烦。