Dear Police and IRS,
I am sorry about your situation.
1) Your total loss is 30K. The other 30K is the tax you should have paid. It does not make things better, but at least is a more accurate perspective.
2) The first line of defense and recovery should be your insurance, business or error and omission insurance. Police report and all your communications with the IRS can substantiate the fact of your loss. In the insurance policies, there could be coverage for all kinds of losses. You may be able to recover some. That is the best route to get any cash recovery for your loss.
3) Find an attorney to discuss the insurance recovery thing before you approach them. Insurance' s company first strategy is to decline our request and find fault of us. You may want to have an attorney to represent you and your company to approach the insurance company.
3) In terms of how you report on your tax return for theft and casualty loss, it depends on your business' structure and type of tax return you report. If it is Schedule C business, partnership, and/or S corporation business flow through, the casualty will be reported on your personal tax return, form 1040 Schedule A, line 20, using with Form 4684. The deduction is subject to 10% of the adjusted gross income on the return. There is a statute of limitation on this. Also, the definition of the date of loss is usually the date you found out and made sure that you could not get it back. This number if causing you loss more than the year's income, may be able to have loss carry back similar to Net Operating Loss. So, please find a professional to help you. -- I don't know what to say, that is where you trouble started.
See below link for Form 4686 instruction.
Let me send you this much for a first response. Otherwise, the discussion is becoming too long to read.
I am still writing and will send you second part very soon.
Fiona Chen, MPA, Ph.D., CPA, ABV, CFF, CITP