What can I do on misuse of grant money?

I'm not a CPA but I do accounting for a company that receives grant funding. I'm currently asked to create time sheets retroactively which match budgets and spending for employees to sign as if they were submitted by the employees themselves on pay day. Other problems involve absorbing subcontract funds and fabricating equipment depreciation numbers on balance sheets submitted to a CPA in anticipation of a yellow book audit and indirect cost proposal/approval process. I wish to leave the company as soon as I can find another job but I need a good exit strategy and to know how much trouble I could be in if my employer tries to blame these business decisions on me. I'm not willing to be a "whistle blower". Thank you.