I wrote it that way using the word "shamus" in the sense of "flatfoot" or "copper" -- see sleazy detective novels of the '30s and '40s.

Well, I told the Legion tonight about you and individuals contributed $29 towards a new bookmobile, with the Legion itself contributing $50. They have also pledged $15,000 as a "double or nothin'" reward fund for the return of the REAL Amos. They also will contact El Legion des Condors Californios de San Diego de Alcala y El Condor Pasa y El Quince Bridaga y Don Diego de la Verga to "track him down and find the REAL Amos and return him to the bosom of his family and friends, assuming he WANTS to be so returned and he didn't just want to duck out for a while or something."

Imposter, beware!