I'm ready to quit and move on, but I'm not sure what I'm supposed to do with this equipment.
I figure I need to mail it back but what is the best approach to this? The laptop is a MacBook so not exactly a cheap piece of hardware and I want to make sure it doesn't "get lost" or damaged on the return trip.
What has been your process when leaving a remote job?
Best case someone will pick everything up. Or you'll have to arrange shipping yourself. In any case they'll need to pay for it, and as long as you packed reasonably/followed instructions it's their problem if something is damaged or lost in transit.
But to answer the topic question, it seems that a recently-made-popular strategy is start on the newer job and keep the older one in low-priority mode until you get fired for low performance. Apparently it might take years depending on how the environment allows you to coast. But I wouldn't do that, and this may be illegal to do depending on your specific situation, jurisdiction and contracts.
At the end of the day though its the company's issue so let them take the lead on it.