Speaking from very recent experience. We submitted our I-485; I-765; and I-131 on 6/27/24 (delivered and tracking with ups). Our credit card wasn’t charged until 7/30 and also didn’t receive text confirmations until then. The text confirmations contained the receipt numbers. The next morning, 7/31, my husband checked the status of all the cases on USCIS tracking tool, and we had received an RFE for the I-485. My husband, the beneficiary, began messaging the EMMA robot on USCIS and if you ask for a live agent enough times you’ll eventually get one. This agent provided him the online access code to be able to check status and to download the RFE from his portal - in that moment rather than waiting for it in the post for 7 days. We were able to respond and upload the requested support in that moment to the USCIS dashboard. Three days after responding to the RFE, biometrics were scheduled.
We had been very anxious waiting for word on the receipt of the cases - my husband called twice and emailed the lockbox office in Elgin. In short a waste of time - because the answer we continuously received from USCIS - until there’s a receipt number and the case has been processed by the lockbox - USCIS cannot help.
Technically the lockbox support website says to wait 30 business days before contacting them or reaching out, and the standard lock box email response is that they’ll respond within 30 days of your inquiry.
I can attest that reading reddits and trying to compare your own timeline to others can be a spiraling experience - had to stop reading them! Haha