Does anyone know a good place to check the value on these?

Ebay. Type in the brand and model # from the blade. Go to "filter" and select "sold"

If you use Chrome you can also right click each image. Click on "search image with google lens". And you will get results of identical and similar knives pictured on ebay and other websites. Click on the link with each image that matches what your researching. Works well sometimes to get you started when you have no model number or have no idea what you have.

If they were like new with the boxes about 120 each. In that condition 30-40 bucks each or so.