at that age we were 'down' to just one pacifier
at around 3 & 1/2, the one pacifier got 'lost'
(it really did!)
and it was nap time...we searched high & low for it & I somehow talked my son into taking his nap without it, telling him it was nap time and he could take a nap & I would continue to look for it. I told him while he was napping I was going to search the whole house & call everyone- daddy, etc, to help try & find it...
it went better than expected!
then that night it was still 'lost'
so I told him to close his eyes & pretend he had his pacifier- I had him remember what it was like- & I told him a little story of him being a baby & geting a pacifier in the hospital, and how it was everywhere; his bouncy, his excersaucer, his crib, his pac n' play, his stroller, his carseat (somehow they like this stuff!)& how as he got bigger it was just for the car seat and crib & sometimes the stroller & then he got bigger & got a big boy bed & then the pacifier was only there for naps and night time & then how he's so big now...then I sang a little song (I made it up) about remembering the pacifier and how it was still with him in his heart & head & how he was going to dream about it, etc).
it worked!
that was the end of the pacifier.
He requested the story maybe for a week or so (they love being told about how they were a baby)&
I still sang the little song to him for maybe a week or two until he just forgot to ask about it...
others have had their child give them to babies in the hospital who need them (gather them & place in a box & wrap up the box as a present)
others have told the story of the Pacifier Fairy who comes and takes the pacifiers (for babies who need them) and then the Pacifier Fairy leaves a present...
you could try a combination of things
HTH (hope this helps)