It’s in Marta’s old room.

↓ Transcript
THEO: Todd, if there was a medical issue going on, don't you think you should have led with that?

TODD: Argh. Amanda...

TODD: Look, Dad, I can't... really get into it. But everything's going to be fine. She's not in any harm.

THEO: Uh-huh. Selkie! I'll give you twenty dollars if you tell me what you did today.

SELKIE (VO): We shot lasers, Grandpa!

TODD: Selkie, goddammit!

THEO: Todd, swear jar. And pull out twenty bucks for your kid's bribe while you're there.

There's approximately two hundred dollars of quarters in that swear jar accumulated over the years