I find myself once again puzzled by a wildcard search.
As I read your Find terms, you're telling Word to not find one or more hard returns followed by a term, designated by parentheses, comprising one or more numerals followed by a period and a space, which term is then followed by another space and then kg. This is then followed by any number of other characters and then a hard return.

My questions, if you would be so kind, are:
1. Is the return avoidance at the beginning actually another way of saying "1 or more of any characters (except that)? Is this used because, say, [?!^13]@ would not for some reason?
2. Why the two spaces after the number of kgs?
3. Why the asterisk after kg? Is this to eliminate the close peren?

Thanks.