appending incomplete data

I have a download of public records from a local County Auditor, regarding property ownership. However, the data, as it is provided is incomplete. I have obtained, from another source, much of the missing data and would like to append the original data.

I don't know if this is even possible, but in 'Googling' it, I am optimistic.

I have attached an Excel 2007 spreadsheet with a sample of the County data on Sheet1 and the data that I would like to append on Sheet2.

Sheet1 lists the parcel number (A), and information regarding the last five recorded sales.
B: Sale Date
C: Deed Type
D: Buyer Name
E: Recording Number
F: Sales Price
G: Multiple Parcels ("Y")
H: Notes
I: Loan Information.

Then the B-I information is repeated four times (J-Q, R-Y, Z-AG, and AH-AO or also defined as columns 10-17, 18-25, 26-33 and 34-41) for a total of the last five sales.

Sheet2 is a listing of sales with similar information.
A: Sale Date
B: Parcel Number
C: Buyer Name
D: Sales Price
E: Recording Number
F: Deed Type
G: Multiple Parcels ("Y")
H: Notes
I: Loan Information

What I hope to do is this:

If the 'Recording Number' (E) on Sheet2 matches the 'Recording Number' (E) on Sheet1, then replace the eight columns on Sheet1 with the data found on Sheet2 (pertaining to a specific sale number).

If the 'Recording Number' (E) on Sheet2 does not match any 'Recording Numbers' (E) on Sheet1, replicate the (unmatched) data (from Sheet2) on Sheet3.

My hope is that this will give me updated, and more complete, data on Sheet1 and also show me all the data that did not match on Sheet3 for me to use later.

I have included headers on both sheets in hope of making things clearer to the reader.

I appreciate any comments that you may have, or any advice in even just getting started.

Respectfully,