Find File By Date. Copy & Paste

I work for a chicken hatchery. So, a couple preliminary things by way of explanation:

1. The day we place our eggs in the incubators, we fill in an excel file containing a list of all the farms from which those eggs came. This is called the "Egg List" workbook.

2. After 21 days have passed, and the eggs have turned into chicks, we open that original file. We copy cells from one column of that file (the workbook is called the “Egg List”, we copy “Sheet1” cells B7:B50), and paste them into another Workbook called “Chick List.”

My question is this:

Is there a macro I can put into the “Chick List” workbook that will automatically locate that particular “Egg list” workbook file that is 21 days old, and paste the contents of its cells B7:B50 into cells A7:A50 in my “Chick List” Workbook. It is preferable if this can be done without opening the old “Egg list” file. But if this is not possible, I’ll take whatever I can get.

Here is what I have, which works okay as far as finding the file. I bootlegged this from another part of this helpful website. But I cannot figure out the syntax for getting cells B7:B50 from the Egg list to copy into cells A7:A50 of the Chick List.

Dim FSO As Object

Sub ProcessFiles()
Dim i As Long
Dim sFolder As String
Dim fldr As Object
Dim Folder As Object
Dim file As Object
Dim Files As Object
Dim this As Workbook
Dim cnt As Long
Dim filenew As Object