Multiple independent claims in one category are per se not a reason for an incomplete search
Generally, an opinion must be given on all searched claims. Only one independent claim in each category needs to be treated in detail; short comments would normally suffice for further independent claims.
Furthermore, if appropriate, an objection as to clarity and conciseness under Article 6 may be made under Box VIII of the WO‑ISA. The EPO as ISA may exercise its discretion to ask the applicant to clarify the subject-matter to be searched, applying the same procedure as described under GL/PCT‑EPO B‑VIII, 3.3 – GL/PCT‑EPO B‑VIII, 3.4.