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Try this

awk 'NR==FNR{a[$1]=$2;next;}{print $1, $2, ( ($1 in a) ? a[$1] : "00000000"); delete a[$1] }END{for(i in a)print i,a[i],"not-exists-in-file1"}' file2 file1

Modify like this

awk 'NR==FNR{a[$1]=$2;next;}{print $1, $2, ( ($1 in a) ? a[$1] : "00000000") }' file2 file1 >file3

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