how much gear or amps is personal possession?

if gear gets caught in the post do you get your house searched or just a letter,how many amps is personal possession?

Depends.

Most people get letters, even some from big orders.

While theres been small orders (I think the story was just some Dbol pills) and the cops staked the house out and arrested the guy.

It depends on how serious your part of the woods takes it.