No you should not be worried, BP can and will fast especially sub-adult and adult when transitioning to a new home.
As for defecation they go when they are ready to, so long there is no visible persistent bulge near the cloaca than there is no reason to worry.
Make sure everything is optimal, cage size, hides, etc, feed the same type of prey that was previously offered, do so in it's enclosure and do not handle him until he eats.
Sooner or later he will resume feeding, he has a good size so there is nothing to worry about.
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