My SSN is printed on my Active Duty ID. So, just about every bartender in San Diego has seen it, everybody in my direct chain of command has access to it and anyone serving in an "official capacity" (gateguards, SSO, etc.) can access it.
There're a number of things someone would have to accomplish before they could effectively use your SSN for identity theft purchases. Address and other personal information. They'd also have to have some other form of independent ID, with your name on it, to open lines of credit and such.
Also, I'd check with the three credit reporting agencies, you're entitled to one credit report per year from each of the three agencies: Equifax, TransUnion and Experian. You can also obtain all three of the reports at once from
www.freecreditreport.com, I believe.
Although, I recommend using them one at a time, because then you could check your report periodically throughout the year. It's going to take more than a week for anything to have been reported/changed.
Jam it back in, in the dark.