If a Eurasian Bullfinch is found in the US, what are the two most likely origins acknowledged?

Answer

Escape from captivity or an exceptionally rare vagrant

Any occurrence in the US is either documented as an escape from captivity or recognized as an exceptionally rare vagrant blown far off course from its native range.

If a Eurasian Bullfinch is found in the US, what are the two most likely origins acknowledged?
locationbirdornithologyanimalBullfinch