Missing Engine Log Book

Hello Guys:

I am in the process buying a malibu and I was just told the engine log
is missing (overhauled in 1996, currently 850 hours smoh)but the owner
has MOST of the invoices for the work done during last nine years since
the overhaul. My questions are the following;

1. How much is the discounted value on this airplane without the engine
log?

2. Can a replacement log book be generated with these invoices? if so,
would it be just a record or a log book that is as good as the orginal?


3. To what extent will the reconstructed log book to be considered a
good one. For example: If the seller has the original invoice for the
overhaul work performed with total time recorded and if a paid receipt
for every annual inspection as attached. will this be acceptable?

Thank you in advance for any input.

Jack