**the books**may very well be the two books he/she ordered from Amazon, but how about [2]? It's implausible she has the whole fifty books in one purse. So it would be natural

**the books**refers to some of the books.

Am I right???

[Both of them my renditions]

[1] I ordered

**two**books from Amazon, and they arrived yesterday. I have

**the books**in my purse. Would you like to take a look?

[2] I ordered

**fifty**books from Amazon, and they arrived yesterday. I have

**the books**in my purse. Would you like to take a look?