Your intents are many and quite complex ..
This should give you a head start in producing a powerful Enquiries sheet ..
Insert a new sheet, label as say: Enquiries, move it to leftmost
In Enquiries,
List in B1 across all the part nums to be checked across all sheets, eg: CA100-87, etc
List in A2 down all the 50 sheetnames, eg: Sheet2, Sheet3, etc
Put this in B2:
=IF(OR(B$1="",$A2=""),"",IF(COUNTIF(INDIRECT("'"&$A2&"'!A:A"),B$1),"x",""))
Copy across / fill down to populate results. It'll flag as "x" where the part numbers are found. COUNTIF can be used to check for existence of items, and within it, INDIRECT can be used to read sheetnames, enabling great ease in formula propagation.
Note: To generate the 50 sheetnames list,
you can run the sub below in a new sheet
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