Tim,
You did well on this deal and as The Shadow said, you should have been wearing a mask, ha, ha.
Serioisly, this is a great deal you made. The magazines should be a wood bottom type with the serial number and Imperial Acceptance Stamp on the bottom. Finding the original magazine is probably not possible, so you should look for a period, mis-matched wood bottom type. I don't have any books with me, but someone will let you know what unit the stamps represent.
Again, congratulations on your first purchase and enjoy both pistols. You need to go to the P.38 Forum and post the info on the P.38. The link to the Forum is attached.
Marvin
The P.38 Forum