if you have never ever used those passes to enter a park, they should be valid.
if you had used them, the pass would have expired 14 days from first usage.
the old passes you mentioned will probably not able to be scanned at the turnstile as the codes would no longer be in the system.
so you would have to use the outside guest services for asking how they could be converted/exchanged.
since wet and wild no longer exists, it would be up to guest services how to handle your request.
on the bottom of my 7 day ticket, the old passes, it stated, expiration, never on the ones from 1999.
the set i exchanged years back was valid for both parks but when i got single day tickets on that pass, it was listed as complimentary tickets.
that meant i could never exchange those 7 tickets for anything in the future.
the ones from 2002 + had about a 20 or so year expiration date.
i traded in the 5 day 2 park passes.
my present ones that are now p2p single day tickets list expiration as 2030.
if you never used them to enter a park, i would think there would be some value on them to do an exchange.
but it all depends on the policy that is in effect now.
i did my exchange knowing Vbay would be opened in a few months.
i had bought about ten sets of the passes years back to use for my sons when they would go with me to the darkside.
i bought the ap in 2002 and keep it renewed each year.
since sons now rarely do orlando, i have tickets for them when they do decide to join me on a free trip.