UPS may notice it, they may not. If they notice it, UPS may take it back, they may not (yes, they can dock a future check or checks for the amount overpaid.) They may take it back at a point you really were looking for that full check. Maybe best to notify them before the money has been spent?
For helper pay I normally make $15.50/hr. This check shows I got paid $17.50/hr. Is it worth letting management know, or is it small enough that they won't notice?
Btw, they almost paid me right for my 78 hours they owed me. They paid me, but they still owe me 10.5 hours.
You have a contractual obligation to notify the company.
"When an employee notifies the Employer in writing of any ongoing overpayment, the employee’s increasing liability will cease five (5) working days after the date of the written notification. The notification shall be provided to the employee’s immediate supervisor or manager."
no just keep it. if they ever do bring you in and fuss at you for it. just say:
"well yeah i don't get why my pay rate is always jumping around, my supervisors never explained my pay stub. and no one else did either." turn to the steward "were they supposed to have trained me about that?"