1)
What is the "Eidus" referring to?
1.
Rashi #1: It is referring to the Seifer Torah, which serves as a testimony between Hashem and Yisrael that Hashem commanded them the Mitzvos that are written in it.
1
Since, according to the Ramban, this Parshah was said before the sin of the Golden Calf - Refer to 25:22:1:2.
2
Which the Torah specifically calls "Luchos ha'Eidus" - in Ki Sisa Sh'mos, 31:18, and "Luchos ha'Beris" - in Eikev, Devarim 9:9 (Rashbam). See also Sifsei Chachamim.
2)
By breaking the Luchos, Moshe did not fulfill Hashem's command to put them in the Aron?