"Jackboxes is for jungle!" - really? NO! They are for early gank! Just make a trap with 3-4 jackboxes in brush and wait your teammate get enemy in your trap! You can also use IGNITE for 100% result.

BUT! Don't run under turret! Shaco is low HP and DEF at start, so you can die very fast from turret and ALSO SAME FAST from MINNIONS! Yeah, thats right! Minnions BLOCKS you and DAMAGES a lot if they are 10-15 at same place.

Make your default trap with 3-4 Jacks and run from brush with you clone to turret. When you clone is LOW-HP it's 70% chance that enemys will follow him and SURPRISE:
1) Clone explosed - damage
2) Jacks fear and damage - half HP enemys
3) Deceive behind and fast hit enemy
4) Shiv - 1 of enemys is dead or almost deal and slowed (if that use Ignite and forget about him ;) )
5) Just HIT! Don't forget that! Shaco is verrrrry powerfull with his basic attacks!

A little bit training and 2-3 kills (900 gold)

+ Somebody'll help you, I think ;)

Don't forget put Jacks on all possible places. They'll save your life for hundred times ;)

You and your enemy are low HP? Use deceive! So... you're gone and enemy is JACKBOXED >D

I don't like jungling with Shaco, because he's very nice in PvP =)

But it doesn't mean that Shaco is bad jungler - he's great at this. All's very simple, just Jackboxes!

PS. If you want jungle, don't take Smite as your summoner spell, because it's almost unuseful on late game, but Ignite also can be used to Monsters and it's OK that damages not so much.

Ignite and Ghost - the only choose for AD Shaco!
Ignite gives you 99% chance that your enemy doesn't run away
Ghost increases your speed (also in Deceive-stealthed - remember that!) and is more usable than Flash!