I went through this crossing from Iran to Iraq at the end of March this year.
The crossing area is still like a large building site, but i was lucky and it was dry, so apart from the dust - of which there was plenty being kicked up by the hundreds of trucks - and deeply rutted construction site like roads which were not suited to an R1, it was all pretty straight forward.......except for the stamping of the Carnet.
No one seemed to know much about them and were really quite disinterested in having anything to do with it. I had to just keep asking by who and when they were going to stamp it, even after all the other formalities were completed.
Eventually one of the immigration guys took me to another temprary portacabin office and handed the problem to someone there, Again they kept telling me that an exit stamp was not required, but after some time and showing them the entry stamp from Bander Abbas port, they did agree to stamp it.....but not in the right place and i had to keep at them to stamp it correctly, which they finally did.
If anyone is planning to pass through this crossing point, you must keep bothering them (politely of course), until you get the stamp that you need, or it might be expensive when you try and retrieve your deposit.
I haven't been able to claim mine back yet as i'm in the UK and the issuing authority is in Abu Dhabi, but hopefully one day i will get back out there to re-claim the £7000 that they wanted to issue the CdP.