There are 2 Buffalo family members in Finland. One is an original F2A-1 that was modified and sent to Finland as the model B239, and it has combat provenance (and a decent number of kills to its name). The second is the sole-surviving Humu, an attempt to locally build the Brewster B239 by copying the overall design but using wooden wings to reduce dependency on critical war materiel. Only 3 Humus were built, with 2 of them likely being a redesign on the same basic airframe. None ever flew in combat.
There is also a static replica Brewster in the Netherlands which may include some components from an ex-Dutch airframe that was diverted to Australia.
The Midway wreck is little more than an encrusted engine crankcase, undercarriage legs and a few other components that have survived 78 years at shallow depth under the Pacific Ocean. There really isn't much left of it.