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What I did:

• Build an artillery turret
• Fill turret with 5 Artillery shells
• Build a Storage chest
• Use Bots to deconstruct Artillery turret

What I expect:

• Content of Storage chest is 5 Artillery shells and 1 Artillery turret

What I got:

• Content of Storage chest is 2 Artillery shells and 1 Artillery turret

So bots seem to destroy Artillery shells in the process so you always get half of the shells (rounded down) back when bots deconstruct an Artillery turret.
This does not happen if the player deconstructs the turret himself by rightclicking it.

I can reproduce this in 16.16, it seems 3 shells get lost if the amount in the turret is greater than 3 (and 2 if greater than 2 etc.).

Thanks for the report. It's now fixed for the next version of 0.16.