En déballant ce carton, j'ai trouvé de beaux abat-jour.

From Lesson 440:Plural compound nouns·French

Questions & Answers about En déballant ce carton, j'ai trouvé de beaux abat-jour.

Why doesn't abat-jour have an "s" at the end in the plural here?
Abat-jour is a compound noun made of a verb (abattre, to block or strike down) and a noun (jour, meaning daylight). In traditional French grammar, the verb part of a compound noun never takes an -s. The noun part only takes an -s if the meaning logically involves multiples. Because a lampshade blocks "light" as an uncountable, general concept, jour stays singular. Note: Under the 1990 spelling reform, writing des abat-jours is also accepted, but the traditional spelling seen in this sentence is still extremely common!
Why does the sentence say de beaux instead of des beaux?
This is a classic rule that is easy to forget: the plural indefinite article des drops its -s and becomes de (or d') when it is immediately followed by a plural adjective that comes before the noun. Because the adjective beaux precedes the noun abat-jour, des must become de.
What does the structure En déballant indicate here?
This is the gérondif (gerund), formed with en plus the present participle of the verb (déballant). It translates to "while unpacking" and is used to show that the unpacking and the finding happened at the exact same time, performed by the same subject.
I thought "box" was boîte. Why use carton?
While boîte is the general word for box, carton specifically refers to a cardboard box, like the ones used for moving, storage, or shipping. Using carton here sounds much more precise and natural for the context of unpacking items.

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