I believe you have an older style S&W case sold as an accessory, not a PC case. This is a one latch version of the same. I’ve seen them sell for $30-$40.
Below are some older style PC cases. I agree with kennyb’s estimated value. The rugs seem to bring less, but I like them better. I don’t believe S&W ever sold PC cases or rugs separately.
This one is from November 2008. It has an embossed logo, rather than an applied medallion.
This is the current accessory case from the S&W web site. MSRP is $49.95
I wouldn’t call any of them high quality. They have plastic corners and dent easily because they’re so thin. I wouldn't suggest doing a drop test.