Most breeders continue to cheek their emails even after they are closed. Try emailing them. Regurgitating is a problem that you don't want to have. The good thing is that the boa has regurged only once (that you know of). So, if this is the first time, take your time in rectifying the problem correctly. The delay in recovery and even death comes from people being too impatient and rushing recovery. It will take numerous weeks before the boa starts feeding regularly. Wait about a week and feed ONE pinky. In the meantime contact the original seller and get as much information as possible (this will help you determine if there were other factors in the regurgitation). If the boa does not regurge the pinky after a week, try giving another one. The boa will not gain drastic weigth with pinkies but that is okay, YOUR BOA WILL NOT STARVE. Have you looked the boa over for mites?
I definitely agree with chiplatham when it comes to keeping your boas. He clearly stated that a "heat pad is okay to use..... IF THE TEMP. IS ACCURATE". It does not matter of its heat tape or a heat matt just as long as you are using a good quality thermostat that gives you good temperature control.
Sorry Dan but I really don't agree with the way you keep your boas, keeping them for 30 years does not make you an expert or means you keep your boas better then anyone else. Especially since it seems you are keeping your boas in a manner most high end breeders would find outdated. I don't know of ANY established breeders that use lights for heat in their enclosures. A snake does not get most of its basking heat from above but from the ground. If the air temperature is 90 the ground temp. is maybe 99 (in the sun/when basking). That is why people now use "heat guns" to determine basking temperatures. If you want heat from above I suggest using heat panels.
Back to the subject, the following are conditions for keeping your boa/s. Oxyrhopus may not like them but it's the exact same conditions Rich Ihle uses, so you make the call.
The ambient temperature inside the enclosure should be about 85 degrees with a warm side of 95 degrees. The “hot spot” of the enclosure should be about 104 degrees (check with a heat gun). Humidity should be kept at over 60% (spraying on a daily basis will accomplish this).
Hope this info. helps.