There are two commonly imported species of Bolitoglossa at this time, B. dolflini and B. mexicana. Both of these species have a very very poor survivial rate for a number of reasons but typically they are infected with chytrid and have little to no fat reserves.
As for the two species you are inquiring after the first is found in Guatamala which does not export any herps at this time so any specimens will be smuggled and illegal. The second species if I remember correctly is a Mexican species. Mexico also does not export any of its native herps and again any available individuals would be smuggled and therefore illegal.
At this time, the only documented Bolitoglossa captive breeding was for B. mexicana in Europe. I have not seen any indication that this was repeated.
Many of the Bolitoglossa species are very range restricted (to the point where one species has already been driven extinct before being described (B.aquatica)). These populations are so small that any collection could push the population below the threshold needed to be viable (as in these area, collection for the pet trade is not done in an enviromentally friendly manner. The habitat is destroyed to get all the animals that can be located).
Ed