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It’s not hard, but it’s still a hurdle. Warrants also can’t be requested from a judge by just anyone in the USPS iirc, so the start of the process often relies on an employee taking time out of their day to report something they deem suspicious in the first place, likely in an understaffed and overworked office that’s not built to handle the package volume of the area they serve.
Tax evasion on top of the other illegal activity can increase the consequences if you’re caught. They tend to require warrants before divulging information to other authorities, however any information gathered through legal means can be used against you.
The main benefit of reporting the income is to reduce the likelihood that somebody gets suspicious of the change in buying habits and starts in investigation in the first place.