These are very early burials in WL, Numbers 3,329 & 3,330 - Consequtive - so presumably buried at same time.
The WL records are notorious for having the Grave Number missing in the Register - but the surviving Register is really the Cash Book - It was more for recording the cost (& payment)!
Other registers would have cross refernced to this, but either have not survived, or were taken into storage by the C of E or City Council and forgotten about!
Copies of the actual register entry can be obatined from the bmsgh - about £4.
As they are so early in the life of WL - only 6 years from opening in 1848 - it may be possible to search through the Grave ddeds register from day 1 until 1854, and try and spot the grave with it's occupants. Quite time consuming.
It is also possible that it is an early Public Grave grave in Section B against the wall of the building in Warstone Parade, where the wall mounted memorials have become 'lost' over time.
Handsworth cemetery will undertake genealogy searches, but it is about £10 minumum and can be wait for weeks to find spare time to undertake it!
I would suggest popping over there - Oxhill Road, and see if they will let you look through the grave deed Register - probabl;y better on a weekend when it may be quiter. they are open 7 days a week.
Brian