I have a model 59 9mm
95% condition
pachmayr grips
original grips
4 S&W mags
2 other mags
1 large capacity mag
DeSantis Holster
original box, wrapping paper, instructions, parts list
dont see any comments about model 59

I don't follow 59's. Had one years ago and thought it was a pretty decent gun. I would venture a guess that it is worth $300-350, pretty much like a 5906. The extra mags and holster would add some to the value of the package.
Check COMPLETED auctions on GB and see what actually sold at what price level.