On gloss:

tanxe
x1 is a box/carton/trunk/crate for contents x2, and made of material x3.
seltaxygau in sense "place inside a box"
g1 boxes t2 inside t1.

In definition:

djata'e
x1=t1 is a lunch/bento (portable) box/carrier containing food x2=c1=t2, and made of material x3=t3
jvonu'oblo
x1 is the dust at the bottom of the cereal box, thereby illustrating the principle that the definition of a lujvo need not be constrained by that of its constituent selrafsi
kumjoibimsmija'i
x1 is cloisonné ornamentation on x2 that exhibits cloisons/cloisters/compartments/cells/separated box regions (filled with/meant for) x2 and with separating barriers x3 (usually metal).
tinsypleta'e
x1 is a cardboard box for contents x2
gordiio
x1 is a loophole or 'thinking outside the box' solution to an intractable problem x2; x1 is disentangling 'impossible' knot; x2 is solved by 'cutting the Gordian knot'
pejypoici'a zei uidje
u1=pr1 is a combo box with text c2 and list [ordered set] po1 in user interface u2.
porsi zei uidje
u1 is a list box with list [ordered set] p1 in user interface u2.

In notes:

vendu'a
v1=x1 sells v2=x2 to buyer v3=x3 and includes d2=x4 for a discounted price of (default free) v4=x5
mludata
x1 and x2 are not indistinguishable from each other, they do not seem to share all their properties (disregarding location and identity), as perceived by observer x3
mlumitu
x1 and x2 are indistinguishable from each other, they seem to share all their properties except maybe their location and identity, as perceived by observer x3
pejypoi zei uidje
u1=pr1 is a drop-down list with list [ordered set] po1 in user interface u2.