This will require some background.  I am an hourly contractor working on an HRIS migration for a small company.  When I interviewed, I told the the VP and my eventual boss that the timeline was unrealistic without a bunch of overtime worked for what they were attempting.  I was brought on to do the job and over the next few weeks continually stressed that I would need more time than 40 hours per week to finish but they were unwilling to pay any overtime.  Three weeks prior to my go live, I had another conversation with my boss where I stated that I had 200 hours worth of work in 120 hours worth of time that they were willing to pay.  He proposed that if I could get the work done in time, that he would 'take care of me' by giving me some time off after go live.  I agreed.

Fast forward, go live went great for my development aspects.  I was asked to continue working on additional projects and was not very concerned about the six days of comp time from my work prior to going live.  Until last Thursday that is.  My manager brought me in and explained that even though they were pleased with my work, they did not have the money to continue paying me after September.  I was pretty shocked as my integration work was well received across the organization and fully expected to be offered a permanent position.  After getting over my shock and updating my resume, I decided to cover my bases with the days off that were promised.  I emailed my boss and asked about the time off.  He was good enough to respond and mention the comp time.  I forwarded that email to my home account just to be safe.  He asked for a face-to-face meeting to discuss further.

I met with my boss and decided it would be a good idea to record the conversation (legal in my state in the US as long as one person knows it is happening).  He recalled the conversation in which he promised the days off and we even came up with a plan for this time off to occur over the next month where I would act like I am 'working from home'.  This is all a little shady to me but at this point with only one month to go, I really only care about what was promised me which leads to my question.  Is there anything else I can do to further protect myself from this guy potentially trying to not give me my comp time off?  

Please note that I am not necessarily worried about missed overtime money as my contract agency does not pay anything additional. Also note that my intent with the steps I have taken to this point is in no way to blackmail him into giving me my time off but if push comes to shove I would send the information to the department of labor and make a complaint against the company.