Figuring out what a box is tuned to

[JL12W7INAGS300 10+ year member]

I recieved a box in a trade and don't really have a use for it. It is however a very well built box so I plan on selling it. The only problem is that I have no idea what it is tuned to. How do I go about figuring out what it is tuned to? The guy I got it from doesn't know either because it was custom built for him by a local shopThanks

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[MrSector9 10+ year member]

find out the volume, find out port area and length of port and ptu them into a box.port calculator