How many bodies were there?

Watching a psuedo-documentary on TV.

Seems that the Vancouver and environs had a rash of shoes washing up on shore over several years, each containing a foot. 7 of them to be precise. It turned out that shoes 2 and 4, and 3 and 5 were paired – from the same bodies.

So my question: what’s the most likely number of bodies out there missing feet for 7 of them to have washed up from 5 bodies?

__This is a probability problem not a forensics one. Body parts washing up near Vancouver are not unusual per police. And the reason feet in shoes were washing up was that people drowned with athletic shoes on. When the meaty parts were consumed, the skeletons became disjointed and the shoes floated.__