The newest BX23S shipping weight is 2475 including both buckets. If ordered with the 3 point hitch, add 50 lbs (2525). There is no crate, just a couple blocks of wood and an orange ratchet strap which amount to under a pound.
May add 10 lbs or so for any dirt that might be built up in buckets and or around the undercarriage that you might not be able to see.
Add about 400 lb for a belly mower if you have that.
Mechanical thumb is about 45 lbs total.
third function is gonna be about 70 lbs (fittings, hoses, etc).
The older generation BX TLBs aren't much different in weight; they're almost the same identical tractors as the newest BX23S with minor differences that amount to nothing, weight-wise.