Your failure to provide a forwarding address is no excuse for not providing you with the itemized deductions and a refund of the remainder within 21 days. Because you did not provide a forwarding address, the landlord should have, under the statute, sent them to the residence you vacated.
My analysis is that you have not waived or lost any rights for return of your deposit or potential additional damages for failure to provide itemized deductions and return of the balance.
The above is general legal and business analysis. It is not "legal advice" but analysis, and different lawyers may analyse this matter differently, especially if there are additional facts not reflected in the question. I am not your attorney until retained by a written retainer agreement signed by both of us. I am only licensed in California. See also avvo.com terms and conditions item 9, incorporated as if it was reprinted here.
That is quite a large amount to lose your rights over.
The landlord, under CC section 1950.5 is required to give you an itemized statement as well as any undisputed amount within 21 days of you vacating. If he doesn't have your address, he must send it to your last known address or whatever you put as where to send notices (most leases have that as part of the agreement).
You were also entitled to have a pre-move out inspection, which I don't think you had. Just because the landlord is out of the country does not relieve him of this requirement.
If he withholds your deposit in bad faith, you may be entitled to twice the amount, if you can prove it.
I would definitely either file a claim in small claims court (against individuals it is now up to $10,000) and try to recover what you believe you are entitled to. I hope you took good photos of the premises before you moved out. If not, it may be harder to prove, because as the plaintiff in a lawsuit you have the burden of proof, but that might be overcome by showing that you paid the deposit, and now the burden shifts to the defendant to prove why he should keep part or all of the deposit. The judge will look at the facts and determine if you are entitled to some or all of your deposit, and if it was held in bad faith, may decide to increase it. You may be entitled to attorney's fees and costs, as per your rental agreement. Good luck.
This is general legal advice intended for informational purposes only and does not create and attorney/client relationship. If you wish further advice, please contact an attorney of your own choosing or you may contact me for further advice and make other arrangements including retaining my services.