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I recently purchased a MTS 3/4 size tuba case to house my Yamaha ybb-103 tuba.
2 questions.
1. This case does not have the actual MTS logo on the side. Instead it has a blank oval in its place. Can I be certain this is actually a MTS case? I am completely happy with the case, just wondering why it is different than others on the market.

2. The Yamaha 103 is on the smaller side of being 3/4, so this case is still a little big for the horn. There is a rectangular support block underneath where the valve casings of the horn would sit in the case, and the block makes the horn sit a little high in the case. Are these support blocks designed to be cut out of the case, while still maintaining the integrity of the lining? I want to take the block out, so the horn sits lower in the case.
Any help would be appreciated.

MTS has changed the shape of their logo in recent years, and besides providing cases under their own name, they make a significant portion of the Conn-Selmer cases. The ones branded, "C.G. Conn" have a blue oval - this may have been removed. I have no idea of the circumstances under which you purchased this case, but it is most likely an MTS.

The MTS 3/4 tuba case is still for an instrument larger than yours. The foam block under the valve casings is designed to support the valveset of a 3/4 BBb tuba closer to the size of a small Conn, King or Olds. It is possible, if you're careful, to cut and peel-back the black covering, cut the foam block to the desired height, then use auto headliner spray adhesive and re-attach the black covering. If you're not comfortable tackling this, a local auto upholstery shop should be able to do it easily enough, and give you a professional-looking job. You might want to also contact MTS Products to inquire about additional foam blocking to help the instrument fit better.