Lookup value on seperate sheet based upon cell value

What I am trying to do is ensure that data is valid by cross referencing it to data on another sheet. Ive uploaded my workbook. The formula would be in the "shipped parts" worksheet in the I column. What I want it to do is search for the value in the D column, looking in the worksheet "material" under the C colum value.

Lets take the last entry. I want to validate that M09401-07J2129-D24 (D39) exists in the column labeled ".25 46100" (C39) on the "material" worksheet. If it is there, I would like it to say "TRUE" in cell I39 of "shipped parts.

For the entry on line 37, I would want to search for 0947L-77944- in the column .375 12560-1 & validate it in I37.

I assume this would take a mix of IF & VLOOKUP functions, but I am lost on how to do it.