The YouTube Bigfoot... What's It All Really About?

[drussell41]

If it had been owned by a private individual, that person may not volunteer the fact that it escaped or was let loose.

True, but wouldn't there be paperwork of passage of the animal? Veterinary records, transport
of the animal to North America and so forth? If this cross-breed came from a private owner,
the verve to obtain one in the first place would tend to suggest some form of care.

Professional care leaves a trail, but your realistic statement does still hold water.

Every once in a while you hear strange stories of some drug dealer having a pet lion or whatever.   Just as an example, I think they'd be capable of doing this without a trail.  

Then the thing gets too big, dangerous and expensive.  Person might be too attached to kill, won't turn in because they want to avoid the authorities, and so the option?   Turn loose.