@thecharizardauthorty used to own all of the Matchprint cards and made that video on YouTube that I linked in the Diglett/Dugtrio lists I’ve made for you. Perhaps he still has a Diglett and Dugtrio left he’s willing to sell to you for the right price?
Both the Charizard sold for 1k USD each early-2017 and I bought the Pikachu for 1k USD as well soon after in mid-2017. At the time I saw a few Matchprint cards for sale on eBay that were already in other people’s hands than Rusty, which were available for roughly 600-1400 USD each. None of them sold for a very long time, though. And no idea what they eventually went for.
In the current market I haven’t seen one being sold for a very long time. With roughly two copies each in existence, a lot of them stay with the collectors that initially bought them. The two Pikachu MATCHPRINT cards in my and Justin’s hands won’t go anywhere anytime soon for example (sorry to all other Pikachu collectors out there).
Anyway, if Rusty doesn’t have the Diglett/Dugtrio anymore and all four copies are in collector’s hands, then best of luck finding them in the first place, and best of luck being able to make an offer that will convince the current owners to sell them.
PS: I personally see errors and these Sample prints as nice-to-haves in my collections. So if you manage to find all the other Diglett/Dugtrio cards except for the MATCHPRINT cards eventually, I think you can still deem it a complete collection at that point. 
I’m missing a couple of Sample Pikachu cards myself that have only emerged once or even never after they were revealed, and although I’d love to add them at some point, I deem them as nice-to-haves for my collection goals.
Greetz,
Quuador