Bought 2 mystery boxes for myself and for my daughter for our Birthdays, since we both have one this month. Got a Dark Initiate LE V4 with Green in hilt LED, and the Dark Arbiter with a White in hilt LED. No sound sadly, but I can add it later. Anyone know if Ultra Sabers offers that as a service?
Comgrats on the two mystery box sabers.
And to answer your question, yes you are able to send them your saber for a sound upgrade. It would be 50 to deassemble and reassemble your saber, 15 to ship it back to you and cost of whatever sound upgrade you desire.