« Reply #6 on: Tuesday 07 May 13 17:37 BST (UK) »
Hi Inor.
I think I have solved the mystery and with your help. The Thomas Musgrave who returned to America in 1892 aged 61 appears to be my ancestor. He gave basic info on the passenger list and appeared to knock 3 years off his age but in the additional list he gave the correct info it seems. Thomas Musgrave, aged 64, miner, widower and came to join 2 daughters in Penna. All that corresponds with my Thomas Musgrave.
He emigrated first in 1886 and knocked a few years off his age but emigrated with his youngest daughter who was given correct info. Yet on all censuses he gave his exact age including the 1900 US census.
Ben
Hi Ben: I think you need to find that "additional list" to eliminate the possibility that there were two Thomas Musgrave's on the same ship. Book Two, as mentioned in the second passenger lits posted by inor, would be somewhere among the 817 images that include the first passenger list with Thomas Musgrave, farmer, on it. The last line of the index card for your ancestor Thomas Musgrave may have a typographical error in the volume number. The passenger lists in question are in volumes X1 and X2, rather than A1. You will see that if if you scroll down to item 16 on this link: https://familysearch.org/search/image/index#uri=https://familysearch.org/records/collection/1921481/waypoints
If you look at the index card for Thomas Musgrave's arrival in 1892, you'll notice, right under the box in which Lord Clive is typed that there is some small print. The numbers become blurred as you enlarge the image, but I can see that they seem to be 9(2?) 28 27(37?), meaning a date in February or September 1927 or 1937. I think it was 1937, when a lot of jobs were created by the U.S. government through the Works Progress Administration to put people to work during the Great Depression. The date is the date on which that index form was created at the printer. But the information on them may have come from the original 1892 passenger lists (more likely) or from old information cards (with original data from the passenger) that were being newly indexed using the Soundex system (which is based on the first three consonants of the surname).
Regards,
John 
Hi John. Yes the date on the card shows most likely when they were indexed, (1937ish) not when the passenger arrived. The indexes were compiled in the 1930s as you said. I checked a few others and it has the same date as 1937 so it does look like the info was from the original lists created at the time they arrived, such as 1894 etc.
I do know that the info on my Thomas's card in 1892 is correct such as the personal info and the number of children there, which shows that there is a record somewhere of his return to America. I do think it is probably the same Thomas who gave info, such as he gave additional info on himself so he appears twice in the cards.
At least I know there is a record of Thomas's return to the US which was copied onto those card indexes (either a passenger list or immigration card).
Ben
Researching:
LONDON, Coombs, Roberts, Auber, Helsdon, Fradine, Morin, Goodacre
DORSET Coombs, Munday
NORFOLK Helsdon, Riches, Harbord, Budery
KENT Roberts, Goodacre
SUSSEX Walder, Boniface, Dinnage, Standen, Lee, Botten, Wickham, Jupp
SUFFOLK Titshall, Frost, Fairweather, Mayhew, Archer, Eade, Scarfe
DURHAM Stewart, Musgrave, Wilson, Forster
SCOTLAND Stewart in Selkirk
USA Musgrave, Saix
ESSEX Cornwell, Stock, Quilter, Lawrence, Whale, Clift
OXON Edgington, Smith, Inkpen, Snell, Batten, Brain
