Good deal. Wives come and go... Boxsters are forever. Errrrr.... wait, I may have got that wrong. (Perhaps not!)
I did a brief internet search to see if there is a difference between a base and S tiptronic transmission and couldn't find an answer. Or, if an S triptronic would work in your base. But, if it would here are three S tip trans for sale from quality porsche parts on eBay. One has 18,000 miles and the other two have 37k and 38K miles. They are $1500 with free shipping. If these would work this may be a good option.
01 Boxster s Porsche 986 Automatic Transmission A86 20 Torque Converter 37 923 | eBay
01 Boxster s Porsche 986 Automatic Transmission A86 20 Torque Converter 38 473 | eBay
01 Boxster s Porsche 986 Automatic Transmission A86 20 Torque Converter 38 473 | eBay