The findOrFail method also accepts a list of ids

The findOrFail method also accepts a list of ids. If any of these ids are not found, then it "fails".

Nice if you need to retrieve a specific set of models and don't want to have to check that the count you got was the count you expected

 1User::create(['id' => 1]);
 2User::create(['id' => 2);
 3User::create(['id' => 3]);
 4 
 5// Retrives the user...
 6$user = User::findOrFail(1);
 7 
 8// Throws a 404 because the user doesn't exist...
 9User::findOrFail(99);
10 
11// Retrives all 3 users...
12$users = User::findOrFail([1, 2, 3]);
13 
14// Throws because it is unable to find *all* of the users
15User::findOrFail([1, 2, 3, 99]);

Tip given by @timacdonald87