rlcarey - that sounds like a rhetorical question, but the predicate crime is forgery. That’s the crux of my question; we suspect forgery but the person whose signature is forged denied it. Knowing this SAR would be useless to everyone, does our suspicion of forgery warrant filing.
HappyGilmore - sorry, the check was deposited, not attempted. The rest that you’re unclear about was badly explained by me, but probably not relevant.
Thanks for the responses.