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First, knowingly cheating on your tax return is not the best idea and it will not be protected by statute of limitation. It means that IRS can audit your return 20 years later and hit you with late fees and penalties.
Just because you don't see it on W2, it doesn't mean it is not there. Those items are reported in boxes 12 and 14 with various codes. Also the employer is claiming it as deduction for the per diem on his corporate return so there's a record of it. And if there's a record there's always a chance that IRS may know on your door asking about it.
If you were reimbursed for your expenses and it is not included on your w2, you cannot deduct it. If you don't use a professional to prepare your tax return, than at least follow the instructions and answer the questions honestly and correctly.
If the other people don't put it down it doesn't mean it is right but it could also mean that it wouldn't make any difference. Also, when IRS conduct a review or audit, it usually audit one specific thing not everything on the return. So unless somebody was audited because of the per diem expenses and IRS allowed knowing that the person was reimbursed, which I doubt, it doesn't mean anything. A return can be audited over and over again for different issue.