If he just tells them you have a stash of drugs there they'd send an officer over for a knock and talk. And that's a big maybe, depends on what your friend says, if you have priors, if they want to pursue your friends information now or later, you're on their time now. However, they don't have enough evidence to get a warrant yet. So obviously when/if the cop comes you don't answer.

If you smoke in your house, I'd get the smell out immediately and clean house / wipe your computer because if the cop smells it outside your door, that's enough PC for a warrant. Maybe depends on your state but I know it's enough for mine.

As for the onions, consider your drop burned. They'd probably start a case (you'd never know if they did, it'd all be kept quiet) and keep an eye on your mail. If you don't receive any packs then nothings going to happen. Just always consider that drop burned. Don't take stupid chances and never open your door for any cops. They want to talk to you make em' get a warrant.