How big is the truck? An 18 wheeler or a little pickup? The following discussion assumes a large quantity. What is the total net weight? If it's hard to get a actual weight, weigh some of them, do some counting, and give me an estimate.
Can you date the boards? Looks like 1984 on one of the photos.
Those 28 (looks like) lead multilayer packages with the gold lids (are they gold - hard to tell, exactly, in the photo) may be worth $200/pound in gold, or more. In the 2nd photo, I see 42 of them (maybe, 1/2 a pound?). That is a primo board. Everything on that board might contain PMs. What percentage of the boards are like that one.
It won't be cheap, but I would definitely spend some money to get assays of certain individual components before selling the boards, especially if there are a lot of good boards like the one in the 2nd photo. Once you have assays - count, weigh, and calculate. Maybe, you have the mother lode sitting there. And, maybe, you don't.
Whether you sell the boards or have them refined, you will always be money ahead if you know the values going in. If you have several tons, you may be better off by hiring a professional rep (like Ledoux) to watch your material being processed and keep the refiner honest.
Sorting as to type and selling on Ebay may very well be your best bet.
I'm excited for you. Take your time, think it out, and get your ducks all in a row. I'm here to help you get a maximum return. Talk to me. Give me details. Evaluation and maximizing profits on PM scrap are what I have done for 40 years.