Rashi on Numbers 7:14/רש"י על במדבר ז׳:י״ד

1עשרה זהב — Understand this as the Targum does: there was in it (it contained) the weight of ten shekels of the Sanctuary.

2מלאה קטרת FULL OF FRANKINCENSE — We do not find frankincense prescribed as an offering for an individual, nor to have been offered on the outer altar except this one alone; this offering of frankincense by the princes was therefore an הוראת שעה, a temporary measure (Menachot 50b).