Thanks Steffan,

I had found the usdbdef.i24 file, converted it to as CSV and took a look at it but I think my lack of knowledge on accounting is doing me a disservice. I found a post here earlier pointing to that and giving a list of what each of the columns meant. (I've been trying to find it to link it here, but I haven't been able to) 

The columns I got were as follows

Some important things that I need to be able to query on are

Number of W2/1099R

Number of Sch B

Number of non-zero lines in the Current Year Depreciation Schedule

Are these things that I could find in the usdbdef.i24 file?