First, as already stated, it is notoriously difficult to guess species from photographs, so please take any ID with caution. Second, the color in your stock is so consistent that it is difficult to believe it might not be of one species - whatever that species might be - which would be my expectation for timber purchased from a cabinetmaker, given the nature of their projects.
Third, if there is some perfectly quartered and perfectly flatsawn portions of the stock which could be smoothed and polished, big leaf mahogany has a fine, distinctive, ladder-like medullary ray pattern on these faces...the quartered face will show a larger, but still relatively fine laddered figure with smaller, regularly distributed pore and arc-like patterns of ray figure across the grain. The flatsawn face will show the moderately sized pore structure and very tiny, consistent ladder figure along the wood between the pores. Even in the white, a properly smoothed sample will show characteristic features.
Attachment: BigLeafVert.jpg
Attachment: BigLeafFlat.jpg
By comparison, the same faces in Shorea (Philippine mahogany) show a much larger scale, more ragged-looking, less regular ray figure laddering on the quartered face and no laddering at all on the flatsawn face. African mahogany (khaya) and sapele likewise have a very different appearance on the flat and quartered faces from big leaf mahogany.
Attachment: ShoreaVert.jpg
Attachment: ShoreaFlat.jpg
The photo of big leaf mahogany with two coats of pore filler shows just how distinctive the laddering becomes under finish, and why even plain-figured genuine mahogany is such a beautiful and distinctive wood.
Attachment: BigLeafFilledVert.jpg
Finally, another sometimes distinguishing factor is the density and coarseness of cut when worked, although we have samples in the shop of all of these woods that are easily confused with the other species, due to exceptional density (low or high for species), similar color, or an unusually smooth or coarse feel when worked with a blade.
I hope this helps. You might also consider visiting a cabinetmaker or well stocked hardwood lumber outlet to obtain samples of all of the common mahogany substitutes and make your own comparisons.
Additional remarks: These shots were taken with an iPhone 7 Plus with a 2x optical zoom using the telephoto lens...the OP might consider taking detailed, close-up photos after cleaning up quartered and flatsawn faces on the stock. There is not enough information in the OP's photographs to have much confidence in any identification offered. The boss just mentioned that the characteristic whiteish mineral deposits seen in some genuine mahogany appears to be visible in at least one of the OP's photos. he suggested that - while he has sometimes seen mineral deposits in other substitute species such as Shorea, these deposits are common (but not definitive) in genuine mahogany.
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I'm hoping someone with a higher "wood IQ" might be able to help me out. 
