Here is the # for items left at a checkpoint. TSA does a fantastic job and catalogs left items by make, model and serial # (where appropriate). They will tell you relatively immediately whether they have the item (always possible somebody else stole the thing when you left it) and will, if you can provide description and serial #, Fedex it to you if you provide a Fedex or credit card #. You can also go out to LAX and pick up the item yourself if that's easier.

Note that there are limited hours and you must listen carefully to the recorded instructions which will play through.

Los Angeles
Los Angeles International Airport
310-242-9073