The Lost & Found is a series of treasure-hunt-style quests in Dead Island 2, in which you recover pieces of evidence to find the location of a key to a secret stash. Later in the story, you also unlock a different type of Lost & Found quest, in which you look for a missing person instead of a missing key.
Jo's Rainy Day Stash is one of the Lost & Found quests in Venice Beach, where you have to find Jo's secret stash and its key. Here's where you can find Jo's secret stash and its keys in Dead Island 2.
How to complete Jo's Rainy Day Stash Lost & Found quest in Dead Island 2
To get the stash and the key, you got to find Jo's three pieces of evidence. The third piece of evidence will get you the key and reveal the location of Jo's secret stash.
The first evidence is in Jo's Rentals shops. There are two Jo's Rentals in Venice Beach, and you need to look up the one next to the Tasty Donut shop for the first evidence.
The second piece of evidence is in Jo's main rental store. It's just around the corner from Blue Crab safe house. The third and final piece of evidence can be found on Jo himself, as he lurks next to his busted red truck in an abandoned parking lot.
You can find the location of Jo's all pieces of evidence in the screenshot below.
Once you have found the evidence, head to Marla's Tapas & Tacos shop, you can find its exact location in the screenshot below. Jo's stash is in Marla's though there's no open door for you to enter this place. However, there's an entrance from the terrace, so you have to make your way up there.
There is a way to climb the terrace from the small parking space right behind Marla's shop. Once you have entered the shop, look for Jo's stash and open it to get the Superior-tier Primed Crowbar.
Doing so will complete Jo's Rainy Day Stash Lost & Found quest and reward you with 2,000 XP.