No. Several times found and several times lost. They remain lost.
Following Texas entry into the Union, they were transferred to the federal arsenal in Baton Rouge.
Governor Houston later made a formal request to the Secretary of War for the return of The Twins to Texas. Before that could happen, Louisiana and Texas seceded. The Twins became the possessions of the Confederate State of Louisiana.
We still wanted The Twins returned. One was located at a Louisiana foundry where it was to be smelted down. The other had been sold to a private citizen. The Louisiana legislature rescued The Twins, restored them to health, mounted them on new carriages and returned them to Texas on 20 April 1861.
The Twins were used at first Battle of Galveston where they disappeared from records until late in 1863 when they were reported to be in the Austin arsenal. In early 1864 they were reportedly on their way to the Rio Grande to be used against federal forces there. No record they ever arrived.
Last plausible but unproven sighting was on Houston's Market Square in mid 1865. The sighting included a description of the plaques placed on them by Louisiana back in 1861.
Only replicas, such as the pair on display at the Texas Military Forces Museum on Camp Mabry in Austin, honor the memory and service of the Twin Sisters